bq34z950 PROTECTION Datasheet

bq34z950 Datasheet PDF, Equivalent


Part Number

bq34z950

Description

SBS 1.1-COMPLIANT GAS GAUGE AND PROTECTION

Manufacture

etcTI

Total Page 30 Pages
Datasheet
Download bq34z950 Datasheet


bq34z950
bq34z950
www.ti.com
SLUSBF0A – APRIL 2013 – REVISED MAY 2013
SBS 1.1-COMPLIANT GAS GAUGE AND PROTECTION
ENABLED WITH IMPEDANCE TRACK™ WITH OPTIONAL DQ INTERFACE
Check for Samples: bq34z950
FEATURES
1
2 Next Generation Patented Impedance Track™
Technology Accurately Measures Available
Charge in Li-Ion and Li-Polymer Batteries
– Better Than 1% Error Over the Lifetime of
the Battery
• Supports the Smart Battery Specification
SBS V1.1
• Optional DQ Communication Interface
• Flexible Configuration for 2-Series to 4-Series
Li-Ion and Li-Polymer Cells
• Powerful 8-Bit RISC CPU with Ultralow Power
Modes
• Full Array of Programmable Protection
Features
– Voltage
– Current
– Temperature
• Satisfies JEITA Guidelines
• Added Flexibility to Handle More Complex
Charging Profiles
• Drives 3-, 4-, and 5-Segment LED Display for
Battery-Pack Conditions
• Supports SHA-1 Authentication
• Complete Battery Protection and Gas Gauge
Solution in One Package
• Available in a 44-Pin TSSOP (DBT) Package
APPLICATIONS
• Notebook PCs
• Medical and Test Equipment
• Portable Instrumentation
DESCRIPTION
The bq34z950 SBS-compliant gas gauge and
protection IC, incorporating patented Impedance
Track technology, is a single IC solution designed for
battery-pack or in-system installation. The bq34z950
measures and maintains an accurate record of
available charge in Li-Ion or Li-Polymer batteries
using its integrated high-performance analog
peripherals. The bq34z950 monitors capacity change,
battery impedance, open-circuit voltage, and other
critical parameters of the battery pack which reports
the information to the system host controller over a
serial-communication bus. SMBus and single-wire
DQ communication interfaces are both available.
Together with the integrated analog front-end (AFE)
short-circuit and overload protection, the bq34z950
maximizes functionality and safety while minimizing
external component count, cost, and size in smart
battery circuits.
The implemented Impedance Track gas gauging
technology continuously analyzes the battery
impedance, resulting in superior gas-gauging
accuracy. This enables remaining capacity to be
calculated with discharge rate, temperature, and cell
aging all accounted for during each stage of every
cycle with high accuracy.
1
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of
Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
Impedance Track is a trademark of Texas Instruments.
2
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
Copyright © 2013, Texas Instruments Incorporated

bq34z950
bq34z950
SLUSBF0A – APRIL 2013 – REVISED MAY 2013
www.ti.com
These devices have limited built-in ESD protection. The leads should be shorted together or the device placed in conductive foam
during storage or handling to prevent electrostatic damage to the MOS gates.
TA
–40°C to 85°C
Table 1. AVAILABLE OPTIONS
PACKAGE (1)
44-PIN TSSOP (DBT) Tube
bq34z950DBT (2)
44-PIN TSSOP (DBT) Tape and Reel
bq34z950DBTR (3)
(1) For the most current package and ordering information, see the Package Option Addendum at the end of this document, or see the TI
website at www.ti.com.
(2) A single tube quantity is 40 units.
(3) A single reel quantity is 2000 units.
THERMAL INFORMATION
THERMAL METRIC(1)
θJA Junction-to-ambient thermal resistance
TA25°C Power Rating
Derating Factor TA> 25°C
TA70°C Power Rating
TA85°C Power Rating
bq34z950
44-PIN TSSOP
(DBT)
47.6
2101
21.01
1155
840
UNITS
°C/W
mW
mW/°C
mW
mW
(1) For more information about traditional and new thermal metrics, see the IC Package Thermal Metrics application report, SPRA953.
This integrated circuit can be damaged by ESD. Texas Instruments recommends that all integrated circuits be handled with
appropriate precautions. Failure to observe proper handling and installation procedures can cause damage.
ESD damage can range from subtle performance degradation to complete device failure. Precision integrated circuits may be more
susceptible to damage because very small parametric changes could cause the device not to meet its published specifications.
SYSTEM PARTITIONING DIAGRAM
PACK+
DISP
LED Display
SMBD
SMBC
SMB 1.1
Data Flash
Memory
JEITA and
Enhanced
Charging
Algorithm
SHA-1
Authentication
DQ
System Control
Over
Temperature
Protection
Temperature
Measurement
Oscillator
Over & Under
Voltage
Protection
Over Current
Protection
PreCharge FET
& GPOD Drive
N Channel FET
Drive
Power Mode
Control
Voltage
Measurement
Impedance
Track™ Gas
Gauging
Coulomb
Counter
AFE HW Control
HW Over
Current & Short
Circuit Protection
Watchdog
Cell Voltage
Multiplexer
Cell Balancing
Regulators
RBI
MSRT
RESET
ALERT
VCELL+
VC1
VC2
VC3
VC4
VC5
REG33
REG25
+
VC1
+ VC2
VC3
+ VC4
VDD
OUT
CD
GND
+ bq294xx
PACK–
2 Submit Documentation Feedback
RSNS
5 mΩ–20 mΩ typ
Product Folder Links: bq34z950
Copyright © 2013, Texas Instruments Incorporated


Features bq34z950 www.ti.com SLUSBF0A – APRIL 2013 – REVISED MAY 2013 SBS 1.1-COM PLIANT GAS GAUGE AND PROTECTION ENABLED WITH IMPEDANCE TRACK™ WITH OPTIONAL DQ INTERFACE Check for Samples: bq34z95 0 FEATURES 1 •2 Next Generation Pate nted Impedance Track™ Technology Accu rately Measures Available Charge in Li- Ion and Li-Polymer Batteries – Better Than 1% Error Over the Lifetime of the Battery • Supports the Smart Battery Specification SBS V1.1 • Optional DQ Communication Interface • Flexible C onfiguration for 2-Series to 4-Series L i-Ion and Li-Polymer Cells • Powerful 8-Bit RISC CPU with Ultralow Power Mod es • Full Array of Programmable Prote ction Features – Voltage – Current – Temperature • Satisfies JEITA Gui delines • Added Flexibility to Handle More Complex Charging Profiles • Dri ves 3-, 4-, and 5-Segment LED Display f or Battery-Pack Conditions • Supports SHA-1 Authentication • Complete Batt ery Protection and Gas Gauge Solution in One Package • Available in a 44-Pin TSSOP (DBT) Package APP.
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